spare key/battery/clothes etc

From Longman Dictionary of Contemporary Englishspare key/battery/clothes etcspare key/battery/clothes etcMORE/EXTRAa key etc that you keep in addition to the one you usually use, so that it is available if the one you usually use breaks, gets lost etca spare keyBring a towel and some spare clothes.a supply of spare batteriesa spare tyre →spare